Civil engineers often use the straight line equation, y hat…

Civil engineers often use the straight line equation, y hat = ax + b, to model the relationship between the mean shear strength of masonry joints and precompression stress, x.  To test this theory, a series of stress tests were performed on solid bricks arranged in triplets and joined with mortar.  The  precompression stress was varied for each triplet and the ultimate shear load just before failure (called shear strength) was recorded.  The stress results for n=7 triplet tests is shown in the accompanying table.   Give a practical interpretation of the estimate of the y-intercept of the least squares line, y hat = .987x + 1.19.

In a study of feeding behavior, zoologists recorded the numb…

In a study of feeding behavior, zoologists recorded the number of grunts of a warthog feeding by a lake in the 15 minute period following the addition of food. The data showing the weekly number of grunts and the age of the warthog (in days) are listed below. Find the value for the coefficient of determination.  

Listening II Listen to the dialogue and choose True or False…

Listening II Listen to the dialogue and choose True or False. Mary and Takeshi are talking about their weekend. 1.Takeshi will go to the mall to see a movie on Sunday. [1]  2. Mary’s classmate will join Takeshi and Mary. [2] 3. Mary will buy a ticket from Takeshi. [3]

In order to replace a piece of equipment, a construction com…

In order to replace a piece of equipment, a construction company needs $120,000 in six years.  The company wants to pay cash for the equipment at that time.  How much should the company invest each month, if the investment account earns at a rate of 4.9% compounded monthly? Round to the nearest cent.